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Line 48: ==Limitations of BPM== The Beam Propagation Method relies on the [[slowly varying envelope approximation]], and is inaccurate for the modelling of discretely or fastly varying structures. It is also inaccurate for the modelling of structures ~~with~~in awhich light propages in large range of angles and for high-index contrast, devices for instance in [[silicon photonics]]. The BPM method can be used to model bi-directional propagation, but the reflections are implemented iteratively which can lead to convergence issues. More rigorous alternatives include [[Eigenmode Expansion]] and [[FDTD]]. ==BPM software==

Beam propagation method: Difference between revisions